SUBTASK 30-41-31-420-013
NOTE: Omit this step when using thermal heat sink compound, G50427.
(6) Put MS122 lubricant, D00095, on the surface of the thermal switch [2] that touches the
window.
SUBTASK 30-41-31-420-014
(7) Put the excessive thermal heat sink compound, G50427, or compound, A00214, on the face of
the thermal switch [2] that touches the window.
NOTE: Optional fairing compounds include GRANGER 610-1016 DC340 and adhesive,
A50061.
CAUTION
DO NOT APPLY TOO MUCH COMPOUND ON THE SWITCH. TOO MUCH
COMPOUND CAN CAUSE DAMAGE TO THE WINDOW.
(a) Use only a very thin layer of thermal heat sink compound, G50427, or compound,
A00214, just enough to cover the surface of the switch when it is against the window with
the retaining spring engaged.
E. Thermal Switch Installation
SUBTASK 30-41-31-420-003
(1) Put the thermal switch [2] in the spring bracket.
(a) Pull the spring back.
(b) Make sure the terminals on the thermal switch [2] are at the hinge of the spring.
(c) Engage the spring with the slot on the rear of the thermal switch [2].
(d) Let the spring push the thermal switch [2] against the window.
(e) Release the spring.
(f) Remove all thermal heat sink compound, G50427, or compound, A00214, that comes out
against the window.
SUBTASK 30-41-31-420-015
NOTE: Omit this step and its substeps when using thermal heat sink compound, G50427.
(2) Make sure the bond is satisfactory.
NOTE: Permit one hour for the sealant to become hard. When the temperature is less than 50
degrees F (10 degrees C), more time is necessary.
(a) Look through the window at the bond.
(b) Make a new bond if you see the following:
1) Bubbles with a diameter of more than 3/32 inches (2.4 millimeters).
2) Bubbles that add to more than 10 percent of the bond.
SUBTASK 30-41-31-420-016
(3) Clean excess thermal heat sink compound, G50427, or compound, A00214, from the area of
the bond and the thermal switch [2] with solvent, B00083.
SUBTASK 30-41-31-420-017
(4) Re-install the trim around the window.
SUBTASK 30-41-31-420-004
(5) Connect the electrical leads [1] to the thermal switch [2].
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-31
Page 407
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 424, 425, 427-429,
502, 503, 507, 514, 524, 533, 535, 537, 556, 557, 568, 583, 588, 592-596, 671, 672,
707-710, 832, 836, 837, 841, 842, 968-970, 972, 973, 980-999; ILF 101, 156-199,
409, 410, 416, 451, 501, 504, 508, 513, 515, 516, 518, 531, 532, 536, 541, 542,
552, 571-574, 576, 686, 803-813, 821, 822, 831, 854-856, 861-863, 871-873 PRE
SB 737-56-1017; ILF 412 POST SB 737-30-1046 OR PRE SB 737-56-1017
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